KR20000018572A - Memory module and socket in which memory module is mounted - Google Patents

Abstract

PURPOSE: A memory module and a socket are provided to have a terminal for connecting with the outside on a wide side as well as a length side thereof, and mount the memory module thereon. CONSTITUTION: A memory module has a plurality of semiconductor memory device(13)mounted on a module PCB(Printed Circuit Board)(11) and a terminal for connecting with the outside on either a wide side or a length side of the module PCB. A power line and a ground wire are connected through the wide side terminal with the memory device. A plurality of address lines are also connected through the wide side terminal with the memory device. A socket comprises a longitudinal inserting portion in which a longitudinal terminal of the memory module is inserted, at least a lateral inserting portion in which a lateral terminal of the memory module is inserted. The lateral inserting portion is a flexible circuit carrier. Thereby, a crosstalk and a reflection which are generated in a complicate wire are reduced.

Description

Memory module and socket for same

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a memory module of a computer, and more particularly, to a memory module having an external connection terminal formed on both a longitudinal side and a width side of a module PCB, and a socket into which the memory module is inserted.

In recent years, the system environment of computers such as personal computers (PCs), engineering workstations, and server computers is rapidly changing to the multimedia era that requires high-definition and various graphics environments. Computer systems are becoming increasingly high capacity, high density, high performance, and compact. Accordingly, in order to achieve high speed and high performance in memory components, a variety of control signals are increasing, and power pins are increasing to reduce noise due to high speed. For this reason, the number of pins of memory modules for computers is increasing. Increasing the number of pins of a memory module inevitably increases the area of the module or the number of stacked layers, making it difficult to design the wiring of the module PCB, and thus acts as a factor that hinders the miniaturization trend of the computer and impairs the performance of the system.

The memory module mounts several semiconductor memory devices in one module PCB and supplies power, control signal, address signal, data signal, etc. to each memory device through the terminal for external connection from the mother board of the system. Refers to a memory device. The memory module is conventionally known as a single in-line memory module (SIMM) in which contacts are arranged in one line on only one side of the module PCB, or a dual in-line memory module (DIMM) method in which contacts are arranged in a line on both sides. It is inserted into a socket installed on a computer motherboard, both of which are pinned only to the longitudinal sides of the module PCB.

A conventional memory module and a socket in which the memory module is mounted will be described with reference to FIGS. 1 and 4, respectively. The memory module has an appearance in which several semiconductor memory devices 3 are mounted on the module PCB 1 and external terminals 5 are formed on the longitudinal side of the module PCB 1. The memory module configured as described above is used by being inserted into a socket 7 installed on a mother board (not shown) of a computer. As a signal supplied from the main board of the computer to the memory element 3 or to be exchanged between the main board and the memory element 3 of the computer, power (Vcc, Vdd, Vss), a control signal, a memory address signal ( address signal), a data signal is required. These signals are connected between the computer main board and the memory element 3 of the memory module through the socket 7 and the external connection terminal 5 inserted therein.

In the related art, since all these signals are connected to the main board of the computer only through the external connection terminal 5 formed only on the longitudinal side, the wiring may inevitably be bypassed when designing the wiring as illustrated in FIG. . In particular, the address line and the control line should be as short as possible to generate less noise and less distortion of the signal. As in the prior art, it is difficult to shorten the wiring length when the external connection terminal is formed only in the longitudinal direction of the module PCB. there is a problem.

As described above, in recent years, since the memory capacity is increased and the required module size is reduced, it is difficult to extinguish a large number of wirings in a limited longitudinal region. This not only reduces the miniaturization of the memory module, but also increases the signal distortion and adversely affects reliability, such as weakening the electromagnetic compatibility (EMC) performance.

It is an object of the present invention to provide a memory module in which a terminal for external connection is formed not only in the longitudinal side of the module PCB but also in the widthwise side.

Another object of the present invention is to provide a memory module socket for inserting and mounting the memory module according to the present invention.

1 is a plan view showing a conventional memory module.

2 is a plan view illustrating a memory module according to an exemplary embodiment of the present invention.

Figure 3 is a plan view showing a memory module according to another embodiment of the present invention.

4 is a conceptual diagram showing a socket for a conventional memory module.

5A is a conceptual diagram illustrating a socket for a memory module according to an embodiment of the present invention.

5B is a conceptual diagram illustrating a socket for a memory module according to another embodiment of the present invention.

6A is a conceptual diagram illustrating a socket for a memory module according to another embodiment of the present invention.

6B is a conceptual diagram illustrating a socket for a memory module according to another embodiment of the present invention.

<Description of Major Symbols in Drawing>

Module PCB (1) Semiconductor Memory Devices (3)

Terminal for external connection (5) Socket (7)

Module PCB (11) Semiconductor Memory Devices (13)

Longitudinal terminal (15) Width terminal (16a, 16b)

Longitudinal Inserts 17 Widthwise Inserts 18a, 18b

Width Insertion Part (19a, 19b) Length Insertion Part (20)

Pushpin (21) cable (23)

Terminal (25)

The present invention provides a memory module in which a plurality of semiconductor memory elements are mounted in a module PCB, and in order to achieve the above object, an external connection terminal is formed on a lengthwise side and at least one widthwise side of the module PCB. .

In the memory module according to the present invention, the power lines Vcc and Vdd and the ground lines GND and Vss connected to the memory device are connected through the width terminal, or the plurality of address lines connected to the memory device are connected to the width terminal. It is preferable that the control line is connected through the width direction terminal or connected through the control element.

The present invention also provides a socket in which a memory module is inserted, in which a plurality of semiconductor memory elements are mounted in a module PCB, and terminals for external connection are formed at the longitudinal and widthwise sides of the module PCB, wherein the memory module is inserted in the longitudinal direction of the memory module. And a longitudinal insertion portion into which the terminal is inserted, and at least one widthwise insertion portion into which the widthwise terminal of the memory module is inserted.

The widthwise insertion portion may be a flexible circuit carrier or may be coupled to at least one end of the longitudinal insertion portion to rotate a predetermined angle.

An embodiment of a memory module and a socket into which the memory module is inserted will be described with reference to the drawings.

Figure 2 shows one embodiment of a memory module according to the present invention. A plurality of semiconductor memory elements 13 are mounted on the module PCB 11, the longitudinal terminals 15 are formed on the longitudinal sides of the module PCB 11, and the widthwise terminals on the widthwise sides of the module PCB 11 are provided. 16a is formed.

3 shows another embodiment of a memory module according to the present invention. Several semiconductor memory elements 13 are mounted on the module PCB 11, and the widthwise terminals 16a and 16b are formed on both sides of both widthwise sides of the module PCB 11, unlike the embodiment of FIG.

According to the present invention, as shown in Fig. 2, the wiring 14a passing in the longitudinal direction of the module PCB is connected through the widthwise terminal 16a or 16b, and the wiring 14b passing in the width direction of the module PCB The wiring pattern of the module PCB can be designed to be connected via the longitudinal terminal 15.

In addition, a wiring pattern can be designed by dividing the types of signals connected to the widthwise terminal 16a or 16b and the longitudinal terminal 15. For example, various power lines Vcc, Vdd, and GND are connected to the width terminals 16a and 16b, and the remaining signal lines (control signals, address signals, data signals, etc.) are connected to the longitudinal terminals 15. Can be designed. Alternatively, since the address lines preferably pass alongside each other, the width terminals 16a and 16b may be dedicated to the address lines, and the remaining signals may be connected to the longitudinal terminals 15. This is an optional design and can be chosen by the designer depending on the type of memory module or pin configuration needs.

Thus, by adding the widthwise terminals 16a and 16b, the degree of freedom in the PCB pattern art can be increased. In general, one of the basic principles of designing a PCB is that the wiring on one side only runs in the horizontal direction, and the wiring on the other side only crosses in the vertical direction. The provision of the widthwise terminals 16a and 16b as in the present invention can follow these basic design principles, and consequently increases the degree of freedom for desired wiring within a limited PCB area.

5a and b illustrate an embodiment of a socket for inserting the memory module described with reference to FIG. 5A is a view showing an embodiment using a flexible circuit carrier as the widthwise insertion portion 18a into which the widthwise terminal 16a is inserted, and FIG. 5B is a widthwise insertion portion 18a and a longitudinal insertion. It is a figure which shows the Example using the socket in which the part 17 is integral.

In FIG. 5A, a flexible cable, also called a flexible PCB, is a copper foil coated on a thin insulating tape and is widely used as a connection medium. After inserting the module PCB 11 into the longitudinal insertion portion 17 provided on the main board (not shown) of the computer, the widthwise insertion portion 18a, which is a flexible cable, is inserted into the widthwise terminal 16a of the module PCB 11. Insert the end of the mounting operation of the memory module according to the present invention.

On the other hand, Fig. 5B shows an embodiment different from Fig. 5A, showing a new type of socket in which the longitudinal insertion portion 17 and the widthwise insertion portion 18a of Fig. 5A are integrated. In Fig. 5B, the socket according to the present embodiment has a longitudinal insertion portion 20 into which the longitudinal terminal of the module PCB 11 is inserted and a widthwise insertion portion 19a into which the widthwise terminal of the module PCB 11 is inserted. It consists of. The widthwise insertion portion 19a is coupled to the fixing pin 21 at one end of the longitudinal insertion portion 20 to insert the module PCB 11 into the longitudinal insertion portion 20 and then the widthwise insertion portion ( 19a) is pushed toward the side of the module PCB 11 to engage with the widthwise terminal 16a of the module PCB 11.

On the inner wall of the opening (opening) of the widthwise insertion section 19a, a terminal 25 is formed in contact with the widthwise terminal 16a of the module PCB 11, and the terminal 25 has a cable communicating with the main board of the computer. (23) is connected.

6A and 6B show an embodiment in which a socket structure similar to FIGS. 5A and 5B is provided, but two widthwise insertion portions 19a and 19b are coupled at both ends of the longitudinal insertion portion 20. The operation of the socket according to this embodiment is the same as that of the socket according to the embodiment shown in Figs. 5A and 5B.

As described above, according to the present invention, the number of pins can be additionally increased without increasing the area of the memory module in response to the increasing number of pins of the memory module, so that the area of the memory module can be reduced compared to memory modules having the same number of pins. Therefore, the manufacturing cost of the module PCB can be reduced. When comparing the total length of PCB wiring with the same performance and the area of the PCB, more PCBs should be stacked because the wiring becomes complicated in a PCB having only longitudinal terminals as in the prior art.

In addition, in PCB design, the type of signals connected in the length direction and the width direction of the module PCB can be distinguished, thus increasing the degree of freedom of wiring design of the module PCB. As in the conventional module PCB, when designing the wiring between the longitudinal terminal and each component, it is very difficult to minimize the length of each wiring and the wiring becomes very complicated. According to the present invention, since wiring or address line data lines, etc. commonly connected to the memory elements can be arranged in the widthwise terminal, the wiring can be simplified, so that crosstalk or reflection generated from complicated wiring can be simplified. Signal distortion and noise generation can be suppressed to improve electromagnetic compatibility (EMC) or electromagnetic immunity (EMI) performance.

In terms of system performance, if the memory module is mounted on the system main board of the computer, the area of the main board can be reduced, thereby increasing the productivity of the computer system. When using the same area of main board, additional memory modules or controllers can be added, which also helps to improve system performance.

Claims (7)

A memory module in which a plurality of semiconductor memory elements are mounted on a module PCB, the memory module having an external connection terminal formed at a lengthwise side and at least one widthwise side of the module PCB. The memory module according to claim 1, wherein a power supply line (Vcc, Vdd) and a ground line (GND, Vss) connected to the memory device are connected through the widthwise terminal. The memory module of claim 1, wherein a plurality of address lines connected to the memory device are connected through the width direction terminal. The memory module of claim 1, wherein a control line for controlling the memory device is connected through the width direction terminal. A socket into which a memory module is inserted, in which a plurality of semiconductor memory elements are mounted in a module PCB, and terminals for external connection are formed at the longitudinal side and the width side of the module PCB. A longitudinal insertion part into which a longitudinal terminal of the memory module is inserted; And at least one width insertion part into which the width direction terminal of the memory module is inserted. The socket for a memory module according to claim 5, wherein the width insertion part is a flexible circuit carrier. 6. The socket of claim 5, wherein the width insertion part is coupled to at least one end of the length insertion part by a fixing pin to rotate a predetermined angle. 7.